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Pinnacle West is a holding company whose principle subsidiary is Arizona Public Service. APS is a vertically integrated regulated utility that provides electric service to 1.2 million customers over a 35,000-square-mile service territory in Arizona, including the city of Phoenix. Approximately 35% of power sold comes from the company's 29% interest in the nearly 4 gigawatt Palo Verde nuclear plant. Operated by APS, Palo Verde is the largest nuclear plant in the U.S. APS will also have invested about $1 billion in utility-scale photovoltaic solar plants when the AZ Sun Program is completed.